Definition of "chlorothalonil" [chlorothalonil]

• A colorless crystalline compound, C8Cl4N2,used as a fungicide on a variety of vegetable crops, peanuts, lawns, and turfs and as a preservative in paints and adhesives. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The most effective have the common name chlorothalonil which will be on the label."
• "Along with Save the Frogs, it features a rogue's gallery of alleged poisons: atrazine, Roundup, chlorothalonil."
• "Three fungicides -- chlorothalonil; mancozeb; and for organic growers, fixed copper fungicides -- are labeled for late blight and will provide fair control."